Bhagavad Gita Chapter 17 Verse 3
भगवद् गीता अध्याय 17 श्लोक 3

सत्त्वानुरूपा सर्वस्य श्रद्धा भवति भारत।
श्रद्धामयोऽयं पुरुषो यो यच्छ्रद्धः स एव सः।।17.3।।



हिंदी अनुवाद - स्वामी रामसुख दास जी ( भगवद् गीता 17.3)
।।17.3।।हे भारत सभी मनुष्योंकी श्रद्धा अन्तःकरणके अनुरूप होती है। यह मनुष्य श्रद्धामय है। इसलिये जो जैसी श्रद्धावाला है? वही उसका स्वरूप है अर्थात् वही उसकी निष्ठा -- स्थिति है।


English Translation of Sanskrit Commentary By Sri Shankaracharya's
17.3 O scion of the Bharata dynasty, the sraddha, faith; sarvasya, of all beings; bhavati, is; sattva-anurupa, in accordance with their minds, in accordance with the internal organ which is imbued with particular impression. If this is so, what follows? The answer is: Ayam, this; purusah, person, the transmigrating soul; is sraddhamayah, made up of faith as the dominating factor. How? Sah, he, the individual soul; is eva, verily; sah, that; yah yat-sraddhah,which is the faith of that individual-he surely conforms to his faith.
And, as a conseence, a persons steadfastness in sattva etc. is to be inferred from the grounds of his actions such as worship of gods etc. Hence the Lord says:


English Translation of Commentary  - Dr. S. Sankaranarayan
17.3 Sattva etc.  The word sattva in  corresponding to ones own sattva is a synonym of svabhava primary nature.  This person i.e., Soul, is necessarily connected with a faith that dominates all [his] other activities.  [Hence], he is to be deemed just to be mainly consisting of that.


English Translation of Ramanuja's Sanskrit Commentary
17.3 Sattva means internal organ (i.e., mind). The faith of everyone is according to his internal organ. The meaning is that with whatever Guna his internal organ is conjoined, ones faith corresponds to that Guna (i.e., Guna as object). The term Sattva covers here body, senses etc., already mentioned. Man consists of faith, viz., is the product of his faith. Of whatever faith he is, viz., with whatever faith a man is possessed, that verily he is; he is a transformation of faith of that nature. The purport is this:  If the person is associated with faith in auspicious acts he becomes associated with fruit of these auspicious acts. Conseently, attainment chiefly follows ones faith.

Sri Krsna further explains the same subject:


Transliteration Bhagavad Gita 17.3Sattwaanuroopaa sarvasya shraddhaa bhavati bhaarata;
Shraddhaamayo’yam purusho yo yacchraddhah sa eva sah.


Word Meanings Bhagavad Gita 17.3sattva-anurūpā—conforming to the nature of one’s mind; sarvasya—all; śhraddhā—faith; bhavati—is; bhārata—Arjun, the scion of Bharat; śhraddhāmayaḥ—possessing faith; ayam—that; puruṣhaḥ—human being; yaḥ—who; yat-śhraddhaḥ—whatever the nature of their faith; saḥ—their; eva—verily; saḥ—they